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Which interpolation method is best for elevation?
Hutchinson’s ANUDEM algorithm
Today, perhaps the most widely used technique for interpolating elevation from contours is Hutchinson’s ANUDEM algorithm, which can be used in the ArcGIS system via the TOPO TO RASTER command. This interpolation method not only uses contours, but also uses surface drainage lines such as streams and rivers.
What is raster interpolation?
The Raster Interpolation tools create a continuous (or prediction) surface from sampled point values. Surface interpolation tools make predictions from sample measurements for all locations in an output raster dataset, whether or not a measurement has been taken at the location.
How do you interpolate a slope?
Know the formula for the linear interpolation process. The formula is y = y1 + ((x – x1) / (x2 – x1)) * (y2 – y1), where x is the known value, y is the unknown value, x1 and y1 are the coordinates that are below the known x value, and x2 and y2 are the coordinates that are above the x value.
What can interpolation be used for in a raster?
Interpolation predicts values for cells in a raster from a limited number of sample data points. It can be used to predict unknown values for any geographic point data, such as elevation, rainfall, chemical concentrations, and noise levels.
How is interpolation used to create an elevation surface?
A typical use for point interpolation is to create an elevation surface from a set of sample measurements. In the following graphic, each symbol in the point layer represents a location where the elevation has been measured. By interpolating, the values for each cell between these input points will be predicted.
How is a raster surface interpolated in ArcMap?
Interpolates a raster surface from points using a two-dimensional minimum curvature spline technique. The resulting smooth surface passes exactly through the input points. Interpolates a raster surface, using barriers, from points using a minimum curvature spline technique. The barriers are entered as either polygon or polyline features.
How can interpolation be used to predict values?
Interpolation predicts values for cells in a raster from a limited number of sample data points and it can be used to predict values at unknown locations. Arc GIS for Desktop Documentation